FROM node:22-alpine AS base

# Install dependencies only when needed
FROM base AS deps
# Check https://github.com/nodejs/docker-node/tree/b4117f9333da4138b03a546ec926ef50a31506c3#nodealpine to understand why libc6-compat might be needed.
RUN apk update && apk add --no-cache libc6-compat && rm -rf /var/cache/apk/*
WORKDIR /app

# Install dependencies based on the preferred package manager
COPY package.json yarn.lock* package-lock.json* pnpm-lock.yaml* ./
RUN \
  if [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm i --frozen-lockfile; \
  else echo "Lockfile not found." && exit 1; \
  fi


# Rebuild the source code only when needed
FROM base AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .

# Next.js collects completely anonymous telemetry data about general usage.
# Learn more here: https://nextjs.org/telemetry
# Uncomment the following line in case you want to disable telemetry during the build.
# ENV NEXT_TELEMETRY_DISABLED 1

# Remove .env files from the final image
# This is a good practice to avoid leaking sensitive data
# Learn more about it in the Next.js documentation: https://nextjs.org/docs/basic-features/environment-variables
RUN rm -f .env*

RUN \
  if [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm run build; \
  else echo "Lockfile not found." && exit 1; \
  fi

# Production image, copy all the files and run next
FROM base AS runner
WORKDIR /app

# Install curl for health checks
RUN apk update && apk add --no-cache curl && rm -rf /var/cache/apk/*

ENV NODE_ENV production
# Uncomment the following line in case you want to disable telemetry during runtime.
ENV NEXT_TELEMETRY_DISABLED 1

RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 nextjs

COPY --from=builder /app/public ./public

# Set the correct permission for prerender cache
RUN mkdir .next
RUN chown nextjs:nodejs .next

# Automatically leverage output traces to reduce image size
# https://nextjs.org/docs/advanced-features/output-file-tracing
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static

# Copy server wrapper for runtime environment variable injection
COPY --chown=nextjs:nodejs server-wrapper.js ./
RUN chmod +x server-wrapper.js

# Copy entrypoint script
COPY --chown=nextjs:nodejs docker-entrypoint.sh ./
RUN chmod +x docker-entrypoint.sh

# Create runtime-config.json placeholder (will be generated at startup)
RUN touch runtime-config.json && chown nextjs:nodejs runtime-config.json

USER nextjs

EXPOSE 3000

ENV PORT 3000

# Use entrypoint script which will start the server with runtime env vars
ENTRYPOINT ["./docker-entrypoint.sh"]